The Trane SWT03335 Thermal Flow Sensor is a 24V AC/DC sensing component designed for compatible HVAC control systems. It uses thermal sensing technology to monitor airflow or fluid movement by detecting changes in heat transfer, providing feedback to support system monitoring and control. Commonly used in compatible air handling units, ventilation equipment, and HVAC applications requ... https://www.partshnc.com/trane-swt03335-thermal-flow-sensor-24v-ac-dc